It would be nice if the regular expression could be made less specific, but some features of your data format make that tricky (e.g. the fact that the value following "=>" can be a zero-length string).

However, I think it's pretty much guaranteed that there will be whitespace between the key/value pairs. Yet, you use /\s*/. Also, nowhere do I see specified that there even may be whitespace around the "=>" — you just made that up. As this file looks to be computer generated, I sincerely doubt that this will ever be the case. Finally: the only place do I see whitespace inside a column value, is in the final column of the line: the timestamp.